|Nationality|Name|Term as a Deputy Judge|Reason for termination|
|---|---|---|---|
|Norway|Frederik Beichmann|30 January 1920 — 6 December 1930|Not re-elected|
|China|Wang Ch'ung-hui|30 January 1920 — 6 December 1930|Not re-elected|
|Finland|Rafael Erich|15 January 1931 — 1 February 1936|Post abolished|
|Portugal|Jose Caeiro da Matta|15 January 1931 — 1 February 1936|Post abolished|
|Romania|Demetre Negulesco|30 January 1920 — 6 December 1930|Not re-elected|
|Yugoslavia|Mileta Novaković|15 January 1931 — 1 February 1936|Post abolished|
|Austria|Josef Redlich|15 January 1931 — 1 February 1936|Post abolished|
|Yugoslavia|Mihajlo Jovanović|30 January 1920 — 6 December 1930|Not re-elected|

Question: how many judges served from january 15, 1931 to feb 1, 1936?
Answer: 4